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Finding the Fourth Proportional to 539,139.20, 809,374.40 and 339,459.20

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Solution

The fourth proportional to 539,139.20, 809,374.40 and 339,459.20 is: 509,607.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,139.20 : 809,374.40 = 339,459.20 : x
  2. Step 2: Convert to fraction form
    539,139.20/809,374.40 = 339,459.20/x
  3. Step 3: Cross multiply
    539,139.20x = 809,374.40 × 339,459.20
  4. Step 4: Simplify right side
    539,139.20x = 274,749,586,324.48
  5. Step 5: Solve for x
    x = 274,749,586,324.48/539,139.20
  6. Step 6: Final answer
    x = 509,607.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.